Heat-sensitive recording material and diphenylsulfone
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United States of America Patent
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Jan 26, 2021
Grant Date -
Nov 1, 2018
app pub date -
Nov 15, 2016
filing date -
Nov 20, 2015
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Abstract
The content of compound(s) having a molecular weight of 650-670, typically a molecular weight of 660, as measured by mass spectrometry, is reduced to 0.5 mass % or less in a heat-sensitive recording material comprising 3,3′-diallyl-4,4′-dihydroxy diphenylsulfone, or in a diphenylsulfone or a color-developing agent. Provided is, thereby, a heat-sensitive recording material, a color-developing agent, or a diphenylsulfone which cause less background fogging under moisture and heat conditions and which has excellent preservation stability of a colored image.
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